服务端：
<?php
$server = new Swoole\Server('127.0.0.1', 9504, SWOOLE_PROCESS, SWOOLE_SOCK_UDP);$server->on('start', function ($server) {echo "UDP Server is started at udp://127.0.0.1:9504\n";
});$server->on('packet', function ($server, $data, $clientInfo) {echo "接收到客户端数据：{$data}，来自{$clientInfo['address']}:{$clientInfo['port']}\n";$server->sendTo($clientInfo['address'], $clientInfo['port'], "我收到你的消息了");
});$server->start();
客户端：
<?php
$client = new Swoole\Client(SWOOLE_SOCK_UDP);
$client->sendto('127.0.0.1', 9504, "测试一下");
echo "收到服务端回复：".$client->recv();//var_dump($client->isConnected());//$socketinfo = $client->getsockname();
//print_r($socketinfo);//$peerinfo = $client->getpeername();
//print_r($peerinfo);$client->close();
输出：
